My thoughts and reminders as GIS Librarian at the University of Texas at Arlington. This blog is primarily a way for me to jot down my ideas and also to record notes from other blogs and feeds out there. Everyone is welcome to follow along if you like.

Saturday, September 13, 2008

ArcMap2GMap Fixes: Thanks for Feedback!

After releasing ArcMap2GMap a couple of weeks ago, two persistent bugs have repeatedly been pointed out by users. I want to document these errors and the fixes, both of them quick, here. The script has been updated on the ESRI ArcScripts page with these fixes, so a fresh download should resolve these issues.

For whatever reason the form text specifying the three procedure steps (that alternated while processing to inform the user which step was currently operating) were not appearing in ArcGIS 9.2. This resulted in the appearance that nothing was happening.

The fix was to add a Me.Repaint command each time the caption of the label is changed. My understanding was that VBA should handle this automatically, but obviously it was not the case here. This creates a bit of unnecessary overhead as the entire form and its contents need to be redrawn jsut to change the label status.

Bug #1: String Length Limitation While Passing to Geoprocessor

There is a string length limitation when passing text strings as parameters to a Python script. The first Python script is called by the VBA using the following command: gp.ArcMap2GMap apiKey, tbxName.Text, tbxTitle.Text, layerInfo. The layerInfo string (last parameter) contains the names of all included layers, as well as all user specified options, including color, thickness, messagebox text, etc. I do not know exactly what the length limitation is, but if too many layers are selected this string is truncated and of course errors ensue.

This was brought to my attention by a user needing to create a p0age with 27 layers.

The fix was to have the VBA write the layerInfo contents to a text file and then after the Python script is invoked, read the contents from the text file.

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About Me

Father of two boys, married to an engineering student, work as a GIS librarian & adjunct professor, love sci-fi/fantasy (especially Gene Wolfe, Rudy Rucker, Jeff Noon, Frank Herbert), table tennis, and a follower of the specific carbohydrate diet since 11/2005; vegan since 07/2006; faltered in the first half of 2008 but am working hard to get back on track.